Chlorine Decay Simulation in Water Distribution System Using EPANET

Chlorine is used as a disinfectant in the water treatment process so that treated delivered safely to consumers. However, chlorine concentration decays when flows from plant supply point, due reaction with natural organic matter and inner surface of pipe. Low may encourage bacteria re-growth, while high can result formation harmful chemical components. Therefore, this study aims simulate complex decay using EPANET. This exercise enables determination dosage required maintain desired requirement given by World Health Organization (WHO) Ministry Health, Malaysia (MOH). A successful model an extended period simulations 72 hours enable mapping spatial temporal variations flow residue concentrations at all links nodes. Constant 3.96 mg/l node R1 has successfully satisfy WHO MOH. The nodes distribution system also depends on usage 5, size service reservoir tank distance reservoir.